Question

Which of the following is a wrong order with respect to the property mentioned against each ?

• A. O22–> O2> O2+ [Paramagnetic moment]
• B. (NO)¯> (NO) > (NO)+ [bond length]
• C. H2> H2+> He2+ [bond energy]
• D. NO2+> NO2> NO2¯ [bond angle]

Answer 1

Answer: (A)

O22–> O2> O2+ $Paramagnetic moment$

Answer 2

Bond order 2.0 2.5 3

H2 > H2+ > He2+ (bond energy)

Bond order 1 0.5 0.5

(In He2+ more electron in antibonding MO's)

NO2+ > NO2 >NO2– (bond angle)

Bond angle 180⁰ 133⁰ 115⁰

O22– < O2+ <O2 (paramagnetic moment)

No. of unpaired e– 0 1 2